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Chandpur Formation
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Chandpur Fm base reconstruction

Chandpur Fm

Period: 
Neoproterozoic

Age Interval: 
late Tonian


Province: 
N.India Lesser Himalaya

Type Locality and Naming

Himachal Pradesh-Uttarakhand, Deoban Basin; named after Chandpur village. Kumaun Region; Kumaun, name derived from a peak (30°42':77°40') in southeastern Himachal Pradesh (Auden, 1934). [Original Publication: Auden, J.B., 1934. The Geology of the Krol Belt. Rec. Geol. Surv. India, 67, 357-454.]


Lithology and Thickness

In Deoban Basin, claystone. Fine alternation of shale, siltstone, quartzwacke; ~1250 m. In Kumaun Region, Siltstone. Olive green and grey phyllites interbedded and finely inter-banded with meta-siltstone and very fine-grained wackes, with local meta-volcanic rocks; ~400m.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Conformable with Mandhali Fm in Deoban Basin, Mandhali rocks (Mandhali Fm) gradually passes into the Chandpur phyllites in Kumaun Region.

Upper contact

Conformable with Nagthat Fm in Deoban Basin, The upper limit in the southern sedimentary belt is unconformity marked by conglomerate purple quartzite of the succeeding Nagthat Fm. (Auden, 1934) in Kumaun Region.

Regional extent

Eastern Himachal and western Uttarakhand in Deoban Basin. The bulk of the Nag Tibba Range in Garhwal from the eastern Nayar to the valley of the Tons and beyond is built up of the Chandpur Fm in Kumaun Region. Forms middle part of Jaunsar Gr, and correlatable to Chhaossa Fm.


GeoJSON

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Fossils

None


Age 

Late Tonian. Age span estimates taken from A.J. Martin, 2017. A review of Himalayan stratigraphy, magmatism, and structure. Gondwana Research 49 (2017) 42–80.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
804.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.85

    Ending date (Ma):  
762.00

Depositional setting

Shelf-mud transition zone of a tidal flat complex, with local turbidites.


Depositional pattern:  


Additional Information


Compiler:  

O.N. Bhargava & Birendra Singh. Age estimates based on A.J. Martin, 2017. A review of Himalayan stratigraphy, magmatism, and structure. Gondwana Research 49 (2017) 42–80.